Sistemática e distribuição do complexo de espécies Cynolebias minimus (Cyprinodontiformes, Rivulidae), com a descrição de duas espécies novas

Costa, Wilson J. E. M.

doi:10.1590/s0101-81751988000400004

Cited by 41 publications

(59 citation statements)

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“…Já foram tema de diversos trabalhos de ictiologia (Cruz & Peixoto 1983;Costa 1988;) e de limnologia (Carmo & Lacerda 1984), que revelaram várias espécies zoológicas novas e endêmicas para a região. Não há registros de publicações que enfoquem exclusivamente a vegetação hidrófila de ambientes temporários, entretanto muitas hidrófitas são mencionadas em abordagens florísticas (Silva & Somner 1984;Sá 1992;Costa & Dias 2001) e fitossociológicas (Araújo & Henriques 1984;Maciel et al 1984;Henriques et al 1986;Araújo et al 1998).…”

Section: Introductionunclassified

Hidrófitas fanerogâmicas de ecossistemas aquáticos temporários da planície costeira do Estado do Rio de Janeiro, Brasil

Bove

Gil

Moreira³

et al. 2003

Acta Bot. Bras.

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Recebido em 25/09/2001. Aceito em 01/06/2002RESUMO -(Hidrófitas fanerogâmicas de ecossistemas aquáticos temporários da planície costeira do Estado do Rio de Janeiro, Brasil). Foi realizado o levantamento florístico das hidrófitas fanerogâmicas de ambientes aquáticos temporários da planície costeira do norte fluminense. O material botânico foi coletado em 27 expedições entre setembro/1998 a julho/2001, herborizado e identificado segundo a metodologia tradicional. As exsicatas foram depositadas no Herbário da Universidade do Rio de Janeiro (HUNI). Foram encontrados 113 táxons, distribuídos em 40 famílias. Os ambientes estudados podem ser caracterizados floristicamente pela família Cyperaceae, representada por 23 táxons (cerca de 20%); seguida pelas famílias Fabaceae e Onagraceae (sete táxons), Poaceae (seis táxons), Asteraceae e Scrophulariaceae (cinco táxons) e Apiaceae, Lentibulariaceae e Polygonaceae (quatro táxons). Estes ambientes sofrem alterações fitofisionômicas marcantes relacionadas com a hidrogeologia. Algumas espécies são anuais, desaparecendo completamente na estiagem; outras suportam a seca, mas têm a população profundamente reduzida, alterando substancialmente a paisagem. Algumas espécies consideradas exclusivamente aquáticas foram encontradas em solo úmido, inclusive em floração. Isto demonstra a necessidade da inclusão de espécies anfíbias nos estudos da flora aquática pois, algumas vezes, a delimitação dos tipos biológicos não é muito definida, além de caracterizar de forma mais adequada estes ambientes.Palavras-chave -hidrófitas, florística, brejo temporário, Rio de Janeiro, planície costeira ABSTRACT -(Phanerogamic hydrophytes from the temporary swampy environments of coastal plains of northern Rio de Janeiro State, Brazil). A floristic inventory of phanerogamic hydrophytes from the temporary swampy environments of coastal plains of northern of Rio de Janeiro State was made. The botanical vouchers were collected in 27 expeditions between September/1998 and July/2001. They were herborized and identified by the traditional methodology. The exsicatae were deposited in the UNIRIO herbarium (HUNI). One hundred and thirteen taxa, distributed among 40 families were found. The environment analyzed could be floristically characterized by the Cyperaceae, represented by 23 taxa (ca. 20%), followed by Fabaceae and Onagraceae (seven taxa), Poaceae (six taxa), Asteraceae and Scrophulariaceae (five taxa) and Apiaceae, Lentibulariaceae and Polygonaceae (four

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Section: Introductionunclassified

Hidrófitas fanerogâmicas de ecossistemas aquáticos temporários da planície costeira do Estado do Rio de Janeiro, Brasil

Bove

Gil

Moreira³

et al. 2003

Acta Bot. Bras.

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“…Type specimens were photographed live about 24 hours after collec tion. Measurements and counts follow Costa (1988). Measurements are presented as percentages of standard length (SL), except for those related to head morphology, which are expressed as percentages of head length.…”

Section: Methodsmentioning

confidence: 99%

Three new species of the killifish genus Melanorivulus from the Rio Paraná Basin, central Brazilian Cerrado (Cyprinodontiformes, Aplocheilidae)

Costa¹

2018

ZSE

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Three new species of Melanorivulus are described from the upper and middle Rio Paraná Basin, central Brazilian Cerrado. These species are members of the M. pictus species group, endemic to central Brazilian plateaus and adjacent areas, and are easily diagnosed by colour pattern characters, but their relationships with other congeners of the group are still uncertain. Melanorivulus proximus sp. n., from the middle Rio Aporé drainage, and M. nigromarginatus sp. n., from the Rio Corrente drainage, are possibly more closely related to other species endemic to streams draining the slopes of the Caiapó range, whereas M. linearis sp. n., from the upper Rio Pardo drainage, middle Rio Paraná Basin, is considered more closely related to M. egens, a species also endemic to this part of the Basin. This study corroborates the high diversity of species of Melanorivulus in the central Brazilian Cerrado plateaus repeatedly reported in previous studies, indicating once more that different species are often found restricted to short segments of the same river drainage. The intense habitat loss recorded in recent years combined to the high species diversity limited to specific Cerrado freshwater ecosystems, the veredas, indicates that species of Melanorivulus endemic to this part of the Brazilian Cerrado are highly threatened with extinction.

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“…Type specimens were photographed live six hours after collection. Measurements and counts follow Costa (1988). Measurements are presented as percentages of standard length (SL), except for those related to head morphology, which are expressed as percentages of head length.…”

Section: Methodsmentioning

confidence: 99%

Description of two endangered new seasonal killifish species of the genus Cynolebias from the São Francisco River basin, Brazilian Caatinga (Cyprinodontiformes, Aplocheilidae)

Costa¹

2017

ZSE

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Two new species of Cynolebias are described from temporary pools of the Verde Grande River drainage, São Francisco basin, in the semiarid Caatinga, a phytogeographical province of northeastern Brazil. Cynolebias elegans sp. n., a member of the C. gilbertoi group, is considered as the smallest species of the genus, reaching about 38 mm of standard length; it is distinguished from all other species of the group by the long unpaired fins, relative position of anal fin and vertebrae, and morphometric data. Cynolebias gorutuba sp. n. belongs to the Cynolebias zeta-clade, a group of large species supposedly feeding on smaller sympatric seasonal killifishes; it differs from other species of the group by the female colour pattern, relative position of dorsal fin and vertebrae, and cephalic neuromast pattern. Both species herein described were not found in recent collecting trips, after their habitats had been drastically modified, and are also possibly highly endangered if not already extinct. Field data relative to gradual habitat decline in the type locality region of C. elegans indicate that after pools lose the dense vegetation that provides shelter to small species, these species such as C. elegans become exposed to larger sympatric predatory species and are extirpated. These data support the hypothesis that small seasonal killifish species specialised in living within marginal shaded areas of temporary pools are more susceptible to environmental changes than other congeners.

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Sistemática e distribuição do complexo de espécies Cynolebias minimus (Cyprinodontiformes, Rivulidae), com a descrição de duas espécies novas

Cited by 41 publications

References 1 publication

Hidrófitas fanerogâmicas de ecossistemas aquáticos temporários da planície costeira do Estado do Rio de Janeiro, Brasil

Hidrófitas fanerogâmicas de ecossistemas aquáticos temporários da planície costeira do Estado do Rio de Janeiro, Brasil

Three new species of the killifish genus Melanorivulus from the Rio Paraná Basin, central Brazilian Cerrado (Cyprinodontiformes, Aplocheilidae)

Description of two endangered new seasonal killifish species of the genus Cynolebias from the São Francisco River basin, Brazilian Caatinga (Cyprinodontiformes, Aplocheilidae)

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